问题描述：
sat一道题
(unlike those of) several decades ago,today's librarians teach students to evaluate the accuracy and objectivity of online resources in addition to helping them find particular books
想问一下括号里为什么不能改成contrary to those
(unlike those of) several decades ago,today's librarians teach students to evaluate the accuracy and objectivity of online resources in addition to helping them find particular books
想问一下括号里为什么不能改成contrary to those
问题解答：
我来补答展开全文阅读